Experimental regression rate profiles of stepped fuel grains in Hybrid Rocket Engines

In this work, we assess the impact of stepped hybrid rocket solid fuel grains on performance engine. The influence Forward Facing Steps (FFS) and Backward (BFS) regression rate is analysed two different cylindrical motors one slab burner with optical access. Accessible post-processing allows to quantify local profiles induced by steps for motors. For burner, novel image processing approaches enable authors correlate findings precisely visual inspection burner. Using grain lengths stressed importance total motor length effect steps. Shorter (118 mm) exhibit higher rates FFS than BFS (+41.3% versus +15.7%), whereas longer (500 profit more from (+26.3% ±0%). Moreover, using three oxidizers (nitrous oxide, hydrogen peroxide gaseous oxygen) fuels (high density polyethylene paraffin) at O/F ratios, showed that beneficial properties are valid numerous configurations. This would allow employment geometries a variety existing Finally, propose possibility approximate designs set multiple